Save Metrics preferences on user profile

[fargito]

Feature Description

The displayed metrics are currently stored and persisted in the localstorage. However when using a different computer, users may want to get the same metrics displayed.

Also users with several projects could want their preferences to be different depending on the project

Proposed solution

• The selected metrics should be stored in a separate table users. It should be linked to User and Project.

• When a user fetches a project, the preferences should be set in the response, with a default if the user has set no preference.

• When a user changes its preferences by selecting metrics, an asynchronous request should be made to update its preferences on the server